Add authors bind stuff

TODO.markdown

@@ -4,7 +4,6 @@
 * put axfr in q
 * make example from chaos
 
-
 ## Nice to have
 
 * Speed, we can always go faster. A simple reflect server now hits 35/45K qps

example_test.go

@@ -51,3 +51,17 @@ func ExampleToDs(zone string) {
 		}
 	}
 }
+
+// Show how to setup the authors for 'authors.bind. CH TXT' or 'authors.server. CH  TXT'
+// queries.
+func ExampleAuthors() {
+	// ... server setup is out of scope ...
+	HandleFunc("authors.bind.", HandleAuthors)
+	HandleFunc("authors.server.", HandleAuthors)
+
+	// To extend the authors list, just append to dns.Authors (a []string)
+	Authors = append(Authors, "G. I. Joe")
+
+	// Or
+	Authors = []string{"Just Me"}
+}